// Copyright (c) 2010 Nickolas Pohilets
//
// This file is a part of the CppEvents library.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#ifndef __CPP__UTILS__RANDOM__HPP
#define __CPP__UTILS__RANDOM__HPP

namespace Cpp {
//------------------------------------------------------------------------------
// Random number generator taken from Wikipedia 
// (http://en.wikipedia.org/wiki/Random_number_generation)
class WikiRandom
{
public:
	WikiRandom(unsigned long z, unsigned long w)
		: m_z(z)
		, m_w(w)
	{}

	unsigned long generate()
	{
		m_z = 36969 * (m_z & 65535) + (m_z >> 16);
		m_w = 18000 * (m_w & 65535) + (m_w >> 16);
		return (m_z << 16) + m_w;  /* 32-bit result */
	}
private:
	unsigned long m_z;
	unsigned long m_w;
};
//------------------------------------------------------------------------------
} //namespace Cpp

#endif //__CPP__UTILS__RANDOM__HPP